What is this - trio of “plastic like” half mollusk shells?

[VintageReefer]

I have a zoanthid rock and I never not really noticed this before, but the rock fell and when putting it back I saw these and wonder what they are

The feel like plastic flippers, or paddles. They are firm but flexible. About 2” long and there are three of them. I can not pull them off the rock, the base of them seems to be a fleshy/meaty core. I assume it’s alive but doesn’t seem like the sort of thing that would be alive.

 

[JoJosReef]

That is interesting. @ISpeakForTheSeas @EeyoreIsMySpiritAnimal

 

[TangerineSpeedo]

I believe from what I can tell from the pictures it is a mollusk. I have one in my tank that is very flat and has grown to about 3 inches in length.

 

[Timfish]

Looks like you have three "Turkey Wing" clams. I have several in one of my systems for years and are 5" - 6" in length. When they open up to feed the 2 halves of the shell are just like an 1/8" apart.

https://www.reef2reef.com/threads/c...brates-bred-in-your-tank.996973/post-11578732

 

[VintageReefer]

I believe from what I can tell from the pictures it is a mollusk. I have one in my tank that is very flat and has grown to about 3 inches in length.

Seems mollusk like to me

 

[VintageReefer]

Looks like you have three "Turkey Wing" clams. I have several in one of my systems for years and are 5" - 6" in length. When they open up to feed the 2 halves of the shell are just like an 1/8" apart.

https://www.reef2reef.com/threads/c...brates-bred-in-your-tank.996973/post-11578732

Never heard of this but confirmed they do open, about 1/8”

Hard to take a good pic but I can see two of them and they are both open

 

[BubblesandSqueak]

almost look like razor clams

 

[VintageReefer]

@encrustingacro any idea what these are?
Mollusk?
Razor clam?
Turkey wing clam?
Other?

Thank you

 

[VintageReefer]

@ISpeakForTheSeas meant to include you also in the above post

 

[encrustingacro]

@encrustingacro any idea what these are?
Mollusk?
Razor clam?
Turkey wing clam?
Other?

Thank you

I'm not very knowledgeable with Molluscs, or most things other than stony corals. Sorry I couldn't have been of more help.

 

[HomebroodExotics]

Very cool. I’ve got one too didn’t know what it was. I can say they are extremely resilient. This one has been through the wringer and really shouldn’t even be alive. But life finds a way.

 

[ISpeakForTheSeas]

@ISpeakForTheSeas meant to include you also in the above post

Second time seeing one like this; these are almost certainly in the Pterioidea superfamily, but I haven't learned enough about the superfamily yet to give a specific ID.

My first thoughts on order of likelihood for the family would be:
-Malleidae (Hammer Oysters)
-Vulsellidae
-Isognomonidae (Tree Oysters)
(These first three are by far the most likely.)
-Pteriidae
-Margaritidae
-Pulvinitidae